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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_005_395">&nbsp;</a>NAME</h4><blockquote>
fwide - set stream orientation
</blockquote><h4><a name = "tag_000_005_396">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="stdio.h.html">stdio.h</a>&gt;
#include &lt;<a href="wchar.h.html">wchar.h</a>&gt;

int fwide(FILE *<i>stream</i>, int <i>mode</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_005_397">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>fwide()</i>
function determines the orientation of the stream pointed to by 
<i>stream</i>.
If
<i>mode</i>
is greater than zero, the function first attempts to make the stream
wide-orientated.  If
<i>mode</i>
is less than zero, the function first attempts to make the stream
byte-orientated.  Otherwise,
<i>mode</i>
is zero and the function does not alter the orientation of the stream.
<p>
If the orientation of the stream has already been determined, 
<i>fwide()</i>
does not change it.
<p>
Because no return value is reserved to indicate an error, an
application wishing to check for error situations should set
<i>errno</i>
to 0, then call
<i>fwide()</i>,
then check
<i>errno</i>
and if it is non-zero, assume an error has occurred.
</blockquote><h4><a name = "tag_000_005_398">&nbsp;</a>RETURN VALUE</h4><blockquote>
The
<i>fwide()</i>
function returns a value greater than zero if, after the call, the
stream has wide-orientation, a value less than zero if the stream has
byte-orientation, or zero if the stream has no orientation.
</blockquote><h4><a name = "tag_000_005_399">&nbsp;</a>ERRORS</h4><blockquote>
The
<i>fwide()</i>
function may fail if:
<br>
<dl compact>

<dt>[EBADF]<dd>
The
<i>stream</i>
argument is not a valid stream.

</dl>
</blockquote><h4><a name = "tag_000_005_400">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_005_401">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
A call to
<i>fwide()</i>
with 
<i>mode</i>
set to zero can be used to determine the current orientation of a
stream.
</blockquote><h4><a name = "tag_000_005_402">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_005_403">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="wchar.h.html">&lt;wchar.h&gt;</a></i>.
</blockquote><h4>DERIVATION</h4><blockquote>
Derived from the ISO/IEC 9899:1990/Amendment 1:1995 (E).
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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